Circuit closer



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Inventor fflflis /ier 1 Attorney 3 --L2H. .Jf%

May 10.1927.

Patented May 10, 1927.

UNETED STATES PATENT QFFEQE.

JOSEPH A. FIEBIGER, OF ST. PAUL, I/IINNLSOTA.

CIRCUIT CLOSER.

Application filed December This invention relates to alarm mechanisi s,and has more particular reference lo a means associated with the doorand its iting mechanism in order that an in will be given whenever saidmechais oncratcd after a manual control switch 1 the building has beenmoved to a closed position.

'lhe primary object of this invention is to provide a relatively simple,but etlicient alarm mechanism particularly adapted for installation indwelli' s without requiring any great skill on the part of the partyinstalling the alarm. The invention comprises but few parts, and beingso co-related when installed as to negative the liability of iniproperoperation of the signal.

With the above and other objects in View as the nature of the inventionwill be better understood, the same comprises the novel form,combination and arrangement of parts hereinafter more fully described,shown in the accompanying drawing and claimed.

In the drawing wherein like reference characters indicate correspondingparts throughout the several views:

liigure l is a plan view of my improved burglar alarm, installed.

Figure 2 is a side elevation of the latch operating n'iechanism controlswitch of the alarm, and

Figure 3 is a slightly enlarged fragmentary section of a contact memberand its supporting bracket, which forms an essential part of the presentinvention.

Now having particular reference to the drawing, indicates the interiorend of the usual knob actuated spring latch control shaft for aconventional type of latch mechanism associated with doors in dwellings,and upon which is to be disposed an essential member of the presentinvention.

My invention per se constitutes the provision of a cross bar-likecontact arm 6 that is formed intermediate its ends with an ofl setsemicircular portion 7, that is adapted to be disposed upon the topsurface of the shaft 5, as clearly shown in Figures 1. and 2. Formaintaining this contact arm in position upon the latch shaft 5, Iprovide clamp plate 8 substantially similar in shape and material tosaid arm, the same comprising an intermediate semi-circular portion forengagement around the lower surface of the latch shaft and. having arms9 9 at its oppo ite ends for face to face engagement 16, 1925. SerialNo. 75,736.

with the arm 6 at opposite sides of the central portion 7 in order thatthe same may be interconnected through the medium of bolt and nutconnections 10.

invention further constitutes the pro vision of a pair of shapedbrackets ll--1l that are adapted to be suitably secured to the door thatcarries the latch mechanism directly beneath the opposite ends of thecontact arm 6 as clearly shown in Figures 1 and 2. The upper horizontalportion of each bracket is provided with a screw threaded opening 12within which threaded from the bottom upwardly a headed metallic thimble13 that is externally threaded at its upper ends for re ceiving closurecap 14 provided centrally with an opening l5. il ithin each thimble is aheaded contact pin .16, the pin portion of which normally projectsthrough the opening 15 through the medium of an enpansible spring 17disposed in said thimble, Figure 3.

Each bracket ll carries an electrical binding post 17 in order that thesame may be electrically connected with one pole of a stor e battery 18through the medium of suitable wires as in Figure 1. In the line ofcircuit between the binding post of the brackets and said storagebattery a preferred form of switch 20 is provided, in order that thebinding post may be readily connected or disconnected electrically fromsaid bat-- tcries.

The present alarm further constitutes the provision of a suitable hellor other electrical, sound producing means 21, one binding post of whichis adapted to be electrically connected to the other pole of the battery18, as shown, while the other post is adapted to be electricallyconnected to the contact arm 6 upon the latch shaft 5.

It will thus be seen that when the switch 20 is closed a movement of theshaft 5, through the medium of the knob in either direction will causeone of the contact arm enc s to engage first the pin 16 and then the caplet of the headed thimble 13 and con sequently complete the circuit tothe bell 21. for giving the alarm that an unauthorized person isattempting to gain access to the dwelling. The provision of the springpressed pin 16 will allow the knob to be turned a greater distance afterthe same has been engaged by one end of the bar 6 in order that asuiiicient alarm will be given before the end of the arm strikes astationary member of the complementary bracket contact, even though theknob is quickly released after being brought to an unexpected sto 3.

It will thus be seen that I have provided a highly novel simple, andefficient alarm, that is Well adapted for all the purposes intended, andeven though I have herein shown and described the most preferredembodiment of the invention with which I am at this time familiar, it isnevertheless to be understood that minor changes may be made thereinwithout departing from the spirit and scope of the appended claim.

Having thus described the invention, What I claim as new and desire tosecure by Letters Patent is A circuitcloser of the class describedcomprising a movable contact arm, an angular bracket supported Withinthe path of movement of said contact arm, one of the leg members 01''said angular bracket having a threaded opening tormed therein, a thimblethreadedthrough the opening, a head formed on one end of the thimble toprovide a closure therefor, said head engaging the leg member of theangular bracket in which the threaded opening is formed, a cap threadedon the open end of the thimble, a headed contact pin arranged Within thethimble, the shank portion of said Contact pin extending through the capand adapted for cooper tion with the movable contact arm, and ancxpansible coil spring arranged Within the thimble and cooperating withthe head of 1? the contact pin for normally urging the same outwardly.

In testimony whereof I afiix my signature.

JOSEPH A. FIEBIGER.

